yosys/tests/opt/opt_share_cat.v

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module add_sub(
input [15:0] a,
input [15:0] b,
input [15:0] c,
input [15:0] d,
input sel,
output [63:0] res,
);
reg [31: 0] cat1 = {a+b, c+d};
reg [31: 0] cat2 = {a-b, c-d};
assign res = {b, sel ? cat1 : cat2, a};
endmodule